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Show 1902.] DR. C. I. FORSYTH MAJOR ON PLIOCENE VOLES. 103 mostly isolated teeth-are so minute and fragmentary, that I have to supplement m y demonstration by sketches. The jaw from the Val d'Arno (text-fig. 13, nos. 8, 9), containing two anterior looted molars, was mentioned by me upwards of twenty years ago. The first lower molar (text-fig. 13, no. 8) exhibits in its anterior portion an enamel islet, which is a very strange feature in a Vole's molar. I a m sorry to trouble members with such a minute detail; but almost the whole interest centres around this insular eccentricity, so to Text-fig. 13. Teeth and jaws of Tertiary Voles. H. G. del. Figs. 1-5 & 7 represent the first lower molars, upper view.-Fig. 1. Mimomys intermedins (Newt.), West Runton Forest Bed (B. M . No. 6968 d, from Savin Coll No 1705): left side.-Figs. 2 & 3. Mimomys plioccenicus (Maj.), Norwich Crag, Thorpe (Norw. Castle Mus. No. 971): fig. 2, left side; fig. 3, right side-Figs. 4 & 5. Mimomys plioccenicus (Maj.), Norwich Crag, Thorpe (Norw Castle Mus. No. 551, from Fitch Coll.) : fig. 4, right side; fig. 5, left side (figured by E. T. Newton,' Forest Bed,' pi. 13. fig. 13)^-Fig. 6\ Mimomys plioccenicus (Maj.), third upper molar, leit side; Last Runton Forest Bed (B. M . No. 6967, from Savin Coll. No. 464).-Fig. 7. Mimomys newtom, spn, East Runton Forest Bed (B. M . No. 6967 a, from Savin Coll. No. 430): left aide -Fig 8 Mimomys plioccenicus (Maj.), first and second lower molars, upper view; Upper Val d'Arno, Italy (Florence Museum).-Fig. 9 a. The same specimen, outer view of the mandible, nat. size.-Pig.. 9 h. The same enlarged, r=root of m2.-Fig. 9 c. The same mandible, inner view, enlarged. |